Adobe Photoshop 7 Tutorials
Color Modes / Bitmap Mode
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Subtitles of the Movie (Adobe Photoshop 7 / Color Modes / Bitmap Mode)
Some modes you need to stop off in gray scale to actually get to. With my RGB dandelion image up, I'm going to go to the image menu>mode, and notice that if I want to get to bitmap or duotone I can't get to those two options. They are grayed out. So in order to make those available, I can only do that from a gray scale image. So I'm first going to convert my RGB image into gray scale, and I'll just say ok to this. And now with my gray scale image, I'm going to choose image menu>mode>bitmap. Bitmap mode brings up the dialogue box asking me to make a few decisions about my image, gives me the value for the original resolution, and the value for the output resolution. And I'm just going to leave them the same for now: 72-pixels per inch. I might choose a bitmap mode if I were designing this image to be faxed to somebody through my computer. Because a fax machine is essentially a bitmap type of printer - it creates black and white images. So I'm going to go with my diffusion dither, since bitmap of course will create either black or white pixels. We have a few options on how we want a dithered effect to appear on our image. We could choose a 50% threshold effect, which would use no dither at all, but essentially look for areas of pixels that are above the 50% threshold and make those white and any ones that are below and make those black. So if we say ok, you can see that I get a very graphic type of effect. I'll undo that, go back to image menu>mode>bitmap and choose diffusion dither, which is usually how I generate my images for a fax. And you can see what it does, of course, is it creates a basic image that you get the idea, but doesn't look that great. And if you wish, we could create a half-tone screen type of effect by choosing the half-tone screen method. And say ok, and it will bring up some options for our screen options. We could type in a particular frequency and angle for our line screen effect, and even the shape of the half-tone screen shape. So I'm going to stick with round, and make this basically look pretty much like what you might see in a newspaper.
Tutorial Information
| Course: | Adobe Photoshop 7 |
| Author: | Andrew J. Hathaway |
| SKU: | 33329 |
| ISBN: | 1889347272 |
| Release Date: | 2002-09-05 |
| Duration: | 11 hrs / 152 lessons |
| Work Files: |
Yes |
| Captions: | No |
| Compatibility: |
Vista/XP/2000, OS X, Linux QuickTime 7, Flash 8 |
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